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当我按照Think Python教科书输入以下代码时,我收到下面的错误消息。无法调用“画布”命令:应用程序已被破坏
该窗口实际上显示,但它不包含所需的内容。
from swampy.World import World
world=World()
world.mainloop()
canvas = world.ca(width=500, height=500, background='white')
bbox = [[-150,-100], [150, 100]]
canvas.rectangle(bbox, outline='black', width=2, fill='green4')
错误信息是这样的:
Traceback (most recent call last):
File "15.4.py", line 4, in <module>
canvas = world.ca(width=500, height=500, background='white')
File "/usr/local/lib/python2.7/dist-packages/swampy/Gui.py", line 244, in ca
return self.widget(GuiCanvas, width=width, height=height, **options)
File "/usr/local/lib/python2.7/dist-packages/swampy/Gui.py", line 359, in widget
widget = constructor(self.frame, **widopt)
File "/usr/local/lib/python2.7/dist-packages/swampy/Gui.py", line 612, in __init__
Tkinter.Canvas.__init__(self, w, **options)
File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 2234, in __init__
Widget.__init__(self, master, 'canvas', cnf, kw)
File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 2094, in __init__
(widgetName, self._w) + extra + self._options(cnf))
_tkinter.TclError: can't invoke "canvas" command: application has been destroyed